
        * {
            padding: 0;
            margin: 0;
            list-style: none;
        }

        .head {
            width: 250px;
        }

        .head p {
            height: 34px;
            line-height: 34px;
            padding-left: 20px;
            font-size: 13px;
            font-weight: 700;
            background-color: rgb(255, 250, 232);
        }

        .head ul li {
            /* 高度为0时就溢出所有的内容，并且隐藏 */
            overflow: hidden;
            height: 0;
            transition: all .7s ease 0s;
            line-height: 34px;
            background-color: blue;
            font-size: 12px;
            padding-left: 30px;
            background-color: #FBF0D2;
        }